I won the Westin St. Louis (Downtown). There wasn't a strong winning bid history for this location, with just a few 4*+ wins starting at $50 going back several months to up to 2 years.
I started by looking for a 4.5* in Forest Park for $40/nt, but then expanded my search to Downtown after 7 failed bid attempts. Here was my bid strategy:
1) Forest Park - Clayton, 4½-Star Deluxe-Plus, $40
2) Alton, $47 - NO
3) Collinsville, $54 - NO
4) Fenton, $61 - NO
5) Frontenac, $68 - NO
6) Granite City - Pontoon Beach, $75 - NO
7) Hazelwood, $82 - NO
8) Add Downtown St. Louis, $55 - NO
9) O' Fallon - St Charles West, $65
WON: The Westin Saint Louis, 4.5* for $65/nt, $82 after taxes.
Under PRICELINE EXPRESS Deals, there was a 2.5* La Quinta with free wifi, breakfast, and parking for $65/nt in Westport. My location is better -- right across from Busch Stadium -- but I do like the amenities at the La Quinta better.